To unlock these, play through the Side Missions. Some will require specific side missions, but to earn them all (especially the More Than Stories memento), you will need to complete all of the side quests. These can be found on the second floor of the Homestead.

To unlock these, you must do specific tasks around the Homestead, as well as the rest of the world. To remove the fog from maps quicker, move through each area from a higher point, be it on roof tops or through trees. These mementos can also be found on the second floor of the Homestead.

The Ben Franklin Room is located on the second floor of the Homestead. There are many Ben Franklin mementos that can be added to the room, and to unlock them, you must craft them. To see what each item needs, see the Inventions page. The Ben Franklin painting will be unlocked when you complete Sequence 12 of the Main missions.

The Almanacs are composed of the Almanac Pages that you have been collecting throughout the whole game. When all of the pages are collected, all of the books will be found on the second floor of the Homestead. See the Interactive maps for all page locations.